We study GroupedSubscriberManager (GQAinspired): subscribers are grouped, per-topic group sets areKV-cached, groups are ordered by measured performance (fasterfirst), and subscribers are ordered by priority (within group).We quantify cache-hit ratios, group prioritization accuracy,and end-to-end throughput under synthetic workloads. Ourapproach achieves cache-hit ratios up to 90% while maintainingpriority semantics and adapting group ordering based onreal-time performance feedback.